This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 25 |
| 5 | 114 |
| 6 | 591 |
| 7 | 3298 |
| 8 | 19532 |
| 9 | 120687 |
| 10 | 771373 |
| 11 | 5061741 |
| 12 | 33943662 |
| 13 | 231751331 |
| 14 | 1606587482 |
| 15 | 11283944502 |
| 16 | 80157645245 |
| 17 | 575105238243 |
| 18 | 4162624144308 |
| 19 | 30365913761136 |
| 20 | 223075674659696 |
| 21 | 1649166676341180 |
| 22 | 12262121068089094 |
| 23 | 91649977839972636 |
| 24 | 688288656744067230 |